TECHNICAL PAPERS: Heat Transfer in Manufacturing

Role of Solidification, Substrate Temperature and Reynolds Number on Droplet Spreading in Thermal Spray Deposition: Measurements and Modeling

[+] Author and Article Information
Y. P. Wan

Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2275e-mail: Yuepeng.Wan@sunysb.edu

H. Zhang

Department of Mechanical Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2300e-mail: hzhang@pml.eng.sunysb.edu

X. Y. Jiang, S. Sampath

Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2275

V. Prasad

Department of Mechanical Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2300e-mail: prasad@pml.eng.sunysb.edu

J. Heat Transfer 123(2), 382-389 (Dec 07, 2000) (8 pages) doi:10.1115/1.1351893 History: Received May 13, 1999; Revised December 07, 2000
Copyright © 2001 by ASME
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Grahic Jump Location
(a) Optical image (using Zygo) showing the morphology of Molybdenum splats on Molybdenum substrate, and (b) surface profile of a typical splat
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Schematic of the droplet deposition process and the relevant geometry
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Statistical comparison between the calculated flattening degree with experimental data for molybdenum on molybdenum, molybdenum on glass and PSZ on steel. (Mo-Steel data are very close to the Mo-Mo data, and hence are not presented here.)
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Change of splat thickness due to spreading (upper part of the curves) and the thickness of solidified layer (lower part) for a molybdenum splat impinging on Mo and glass, respectively, and PSZ on steel
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Viscous dissipation dominating region is above the lines representing the criteria for different materials. The shadowed area represents the typical droplet conditions in plasma spraying.
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Dependence of flattening degree on droplet diameter and impacting velocity for molybdenum droplets on two different substrate materials
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Relationship between the flattening degree and Reynolds number. Curves represent the correlation, and scattered values are calculated flattening degree for droplets with different sizes and different velocities by solving Eq. (1) and Eq. (5).
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Dependence of flattening degree on substrate temperature for different materials
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Dependence of flattening degree on droplet overheating
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Thickness of a molybdenum splat and the solidified layer showing the influence of thermal contact resistance (m2 K/W) on spreading and solidification



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